atto3DR

3-dimensional sample rotator including chip carrier socket

The atto3DR double rotation module provides access to full magnetic field (e.g. 9 T) in all directions relative to the sample surface. This is a feature which is unheard of even with significantly more expensive 2D/3D vector magnet setups, simply because split coil configurations do not achieve such high field values. The module comes fully wired and equipped with a convenient leadless ceramic chip carrier (LCCC) socket with 20 contacts, which makes sample exchange a quick and

easy task. All parts are non-magnetic, and are compatible with all attoCRYO setups with a 2” sample space and exchange gas cooling – whether it is a dry or a liquid setup. The atto3DR allows for rotation around a horizontally fixed axis, and an additional in-plane axis. This allows for a ±90° tilt between sample surface and field, as well as another ±90° of in-plane rotation. Any relative orientation between sample and field is accessible.

Fields of Application

Magneto-Transport

Nanowires

Transport Measurements

PRODUCT KEY FEATURES

in-situ two-axes rotation

full field (e.g. 9 T) in 3D

integrated chip carrier socket

eucentric rotation

plug & play module

resistive encoder for closed loop operation

software control (GUI & LabVIEW)

BENEFITS

achieve arbitrary field orientations without the need for an expensive vector magnet

other cryostats available on request

Due to the arbitrary orientation inherent to self-assembled materials on the substrate, typical characterization techniques such as magnetoresistance measurements conducted at cryogenic temperatures greatly benefit from the possibility to freely change the mutual orientation of external magnetic field and sample. Although this is easily possible e.g. by using a 3D vector magnet setup, the associated costs (>> 100 k$) are often prohibitive. Single axis sample rotator setups on the other hand not only require choosing either an out-of-plane or in-plane configuration prior to cooldown, but also put firm restrictions on certain measurements which rely on a precise orientation of the field e.g. perpendicular or parallel to an initially unknown direction along a sample structure. The perfect solution to such applications is attocube’s 3-dimensional rotator atto3DR.

Similar to a recent publication by C. H. Butschkow and co-workers [1] from the group of Prof. Dieter Weiss (Univ. of Regensburg), magnetotransport measurements on individual GaAs/(Ga,Mn)As core-shell nanowires (top figure) have been conducted.

The center figure shows magnetoresistance at 5 T as a function of the angle between externally applied magnetic field and the nanowire axis for different rotation planes: (orange) in-plane rotation, referring to the SiO2 substrate plane, (green) out of plane (perpendicular) rotation with the long nanowire axis entirely in the rotation plane, and (blue) out of plane (transversal) rotation with the rotation plane transversal to the nanowire axis.

The bottom figure shows the normalized magnetoresistance as a function of the angle between externally applied magnetic field and the nanowire axis for various magnitudes of the external magnetic field.

(measured by C. Butschkow in collaboration with attocube application labs 2012; sample courtesy of C. Butschkow, University of Regensburg).